The buyback floor has been tested. It is gone.
The one intervention the Treasury has tried against the long-end rout has been fully absorbed, and the remaining options are either debasement by another name or a Fed that has just said it will not help.
On 19 August the Treasury said it would at least double its buybacks of long-dated bonds, from $2bn to $4bn per operation, running from 9 September to 4 November, framed as liquidity support for the 10-to-30-year sector. The 30-year yield fell. It has now come all the way back: 5.27% on Tuesday, which Bloomberg describes as the level seen moments before the announcement, and the 10-year at roughly 4.80% is more than 10 basis points higher than it was then. Note the timing. The enlarged operations have not started. The market priced the announcement and discarded it before a single $4bn bid was placed. Scale explains why. In the week to 29 August the Treasury sold $797bn of securities, $235bn of it in notes. Against that flow a $4bn buyback is not a price tool; it only ever worked as a signal. Mechanically a buyback retires old, illiquid off-the-run long bonds and the Treasury pays for them with new issuance — in practice, we take it, shorter paper. That smooths trading in the old bonds. It does not change how much duration the market is asked to hold unless the funding shifts to bills and stays there, and doing that at scale is what the commentary quoted by Reuters means by "debasement" worries. It is worth being precise about what this is not. Kashkari says the Treasury market is "functioning as it should"; no auction has tailed in the reporting we have; swap spreads narrowed rather than blew out. This is a repricing of term premium — $40tn of federal debt, $182bn of AI-related bonds from hyperscalers and chipmakers this year by PIMCO's count, an oil shock feeding inflation — not a plumbing failure. The distinction matters for the meter: price is fragility, plumbing is ignition. What is left in the kit is bigger and more political. Shifting issuance toward bills, or the Fed. Warsh used Jackson Hole to call 2% "a firm and fixed target". No help from that side.